Smartxxx Opx 2mb On A V1.6 Xbox

I have a V1.6 xbox with a SmartXXX OPX 2Mb chip installed. Everything worked fine I formated the system with slayer 1.6 and then one day I was changing setting in mediaCenter and the system stalled. I rebooted and ever since the SmartXXX splash screen flashes for a second and then black screen no noise nothing. Any ideas?